UNIVERSE

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Across
  1. 2. electromagnetic radiation that can be detected when a neutron star beam sweeps by earth
  2. 4. a large collection of stars, gas, and dust that is held together by gravity
  3. 5. magnitude measures how bright a star would be from a standard location
  4. 6. a large celestial body that is composed of gas and emits light
  5. 9. a high-mass star that is very hot and bright
  6. 13. a large cloud of gas and dust in space
  7. 16. causes parts of the nebula to collapse
  8. 17. molecules that absorb radiation from the sun
  9. 18. the collection of large and small bodies that orbit a central star
  10. 20. a gigantic explosion when a high-mass star throws its outer layer into space
Down
  1. 1. a spherical body that orbits the sun
  2. 3. magnitude is the measure of a star’s brightness as seen from Earth
  3. 7. the word scientist use to describe space and all the energy and matter in it
  4. 8. the closest star to Earth
  5. 10. the actual brightness of a star
  6. 11. the color with a surface temperature of above 25000 degrees Celsius
  7. 12. dwarf the core of a star becomes denser and very hot
  8. 14. the mass of the star is compressed into a single point
  9. 15. the distance light travels in one year
  10. 19. a small body that orbits planets